Be familiar with codes already had, to keep consistent with the style and use.

Highly reusable, no duplicated codes or configurations.

Delete codes out of use in time.

Contributor Covenant Submitting of Conduct

Make sure all the test cases are passed, Make sure mvn clean install can be compiled and tested successfully.

Make sure the test coverage rate is not lower than the dev branch.

Make sure to check codes with Checkstyle. codes that violate check rules should have special reasons. Find checkstyle template from sharding-sphere/src/resources/sharding_checks.xml, please use checkstyle 8.8 to run the rules.

Contributor Covenant Code of Conduct

Use meaningful class, method and variable names, avoid to use abbreviate.

Return values are named with result; Variables in the loop structure are named with each; Replace each with entry in map.

Exceptions when catch are named with ex; Exceptions when catch but do nothing are named with ignored.

Name property files with camel-case and lowercase first letters.

Have constants on the left and variable on the right in = and equals conditional expressions; Have variable on the left and constants on the right in greater than and less than conditional expressions.

Use LinkedList in priority. Use ArrayList for use index to get element only.

Use capacity based Collection such as ArrayList, HashMap must indicate initial capacity to avoid recalculate capacity.

Design class as final class expect abstract class for extend.

Make nested loop structures a new method.

Use guard clauses in priority.

Minimize the access permission for classes and methods.

Private method should be just next to the method in which it is used; writing private methods should be in the same as the appearance order of private methods.

No null parameters or return values.

Split codes that need to add notes with it into small methods, which are explained with method names.